Digest reproducing apparatus and digest reproducing apparatus control method

• US 20060222337A1
• Filed: 03/07/2006
• Published: 10/05/2006
• Est. Priority Date: 03/30/2005
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Fujii, Yukio, Fujikawa, Yoshifumi
• Application Number:
  US11/368,669
• Publication Number:
  US 20060222337A1
• Time in Patent Office: Days
• US Class Current: 386/241
• CPC Class Codes: G06F 16/739 in form of a video summary, e.g. the video summary being a video sequence, a composite still image or having synthesized frames
• CPC Class Codes: G11B 27/28 by using information signals recorded by the same method as the main recording G11B27/22 takes precedence
• CPC Class Codes: H04N 21/4147 PVR [Personal Video Recorder] H04N5/76 takes precedence ; arrangements for broadcast with accumulation-type receivers H04H20/40
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 21/8146 involving graphical data, e.g. 3D object, 2D graphics
• CPC Class Codes: H04N 21/8456 by decomposing the content in the time domain, e.g. in time segments
• CPC Class Codes: H04N 21/8549 Creating video summaries, e.g. movie trailer retrieval in video databases by using presentations in form of a video summary G06F16/739
• CPC Class Codes: H04N 7/163 by receiver means only
• CPC Class Codes: H04N 9/8227 the additional signal being at least another television signal

Abstract

A digest reproducing apparatus which creates and shows a digest which gives an overview of a whole motion video content regardless of the number of scenes included in an original content. To achieve the above technique, for example, we need to record data on plural still images obtained by encoding plural consecutive still images in time order, detect a scene change in a motion video obtained by reproducing the still image data in time order, calculate an index value indicating the significance level of each still image in the motion video from the still image data, rank scenes in the motion video based on index values indicating the significance levels of still images, and reproduces digest still images included in a specified number of scenes selected according to the ranking.

Claims

1. A digest reproducing apparatus comprising:

a data recording part that records data, as motion video data, on a plurality of still images obtained by encoding a plurality of consecutive still images in time order;

a scene change detecting part that detects a scene change in a motion video obtained by reproducing the still image data in time order, based on the still image data;

a significance level calculating part that calculates an index value indicating the significance level of each still image in the motion video from the still image data;

a scene ranking part that ranks scenes in the motion video based on index values indicating the significance levels of still images included in each scene of the motion video; and

a digest reproducing part that reproduces as a digest, in time order, still images included in a specified number of scenes selected according to the ranking.

2. The digest reproducing apparatus according to claim 1, wherein the scene change detecting part:

calculates, for each still image, color distribution data indicating the number of pixels representing each color, based on data indicating colors of pixels constituting each still image, which is included in the still image data;

calculates an index value indicating the degree of difference of color distribution data on each still image from color distribution data on the immediately preceding still image in terms of time; and

detects a scene change based on a result of comparison of the index value with a reference value.

3. The digest reproducing apparatus according to claim 1, wherein the importance level calculating part:

calculates, for each still image, color distribution data indicating the number of pixels representing each color, based on data indicating colors of pixels constituting each still image, which is included in the still image data;

calculates an index value indicating the degree of difference of color distribution data on each still image from color distribution data on the immediately preceding still image in terms of time;

calculates an index value indicating a sound volume in reproducing of each still image, based on sound data included in the still image data; and

calculates an index value indicating the significance level of each of the still images, based on the index value for the degree of difference and the index value for the sound volume.

4. The digest reproducing apparatus according to claim 1, wherein the scene ranking part ranks the various scenes in the descending order of highest index values in the various scenes, each index value indicating the significance level of a still image in a scene.

5. The digest reproducing apparatus according to claim 1, further comprising a digest scene number input part that receives information on the specified number of scenes to be reproduced in the digest, which is entered through a user interface.

6. The digest reproducing apparatus according to claim 5, further comprising a digest reproducing time input part that receives information on reproducing time of the digest which is entered through a user interface, wherein:

the digest reproducing part reproduces still images included in the specified number of scenes selected according to the ranking, in time order as a digest in which the reproducing time of each scene corresponds to a time duration obtained by dividing the digest reproducing time by the specified number.

7. The digest reproducing apparatus according to claim 6, wherein the digest reproducing part reproduces still images included in the specified number of scenes selected according to the ranking, in time order as a digest in which each scene begins from a still image with the highest significance level index value in the scene and the reproducing time of each scene corresponds to a time duration obtained by dividing the digest reproducing time by the specified number.

8. The digest reproducing apparatus according to claim 1, further comprising a broadcast data receiving part that receives broadcast sound and image data as the motion video data.

9. The digest reproducing apparatus according to claim 1, further comprising a communication data receiving part that receives, as the motion video data, sound and image data which is sent from a data processing unit connected in a communicable manner.

10. A method of controlling a digest reproducing apparatus which records, as motion video data, data on a plurality of still images obtained by encoding a plurality of consecutive still images in time order, wherein the digest reproducing apparatus:

detects a scene change in a motion video obtained by reproducing the still image data in time order, based on the still image data;

calculates an index value indicating the significance level of each still image in the motion video from the still image data;

ranks scenes in the motion video based on index values indicating the significance levels of still images included in each scene of the motion video; and

reproduces as a digest, in time order, still images included in a specified number of scenes selected according to the ranking.

11. The digest reproducing apparatus control method according to claim 10, wherein the digest reproducing apparatus:

calculates, for each still image, color distribution data indicating the number of pixels representing each color, based on data indicating colors of pixels constituting each still image, which is included in the still image data;

calculates an index value indicating the degree of difference of color distribution data on each still image from color distribution data on the immediately preceding still image in terms of time; and

detects a scene change based on a result of comparison of the index value with a reference value.

12. The digest reproducing apparatus control method according to claim 10, wherein the digest reproducing apparatus:

calculates, for each still image, color distribution data indicating the number of pixels representing each color, based on data indicating colors of pixels constituting each still image, which is included in the still image data;

calculates an index value indicating the degree of difference of color distribution data on each still image from color distribution data on the immediately preceding still image in terms of time;

calculates an index value indicating a sound volume in reproducing of each still image, based on sound data included in the still image data; and

calculates an index value indicating the significance level of each of the still images, based on the index value for the degree of difference and the index value for the sound volume.

13. The digest reproducing apparatus control method according to claim 10, wherein the digest reproducing apparatus ranks the various scenes in the descending order of highest index values in the various scenes, each index value indicating the significance level of a still image in a scene.

14. The digest reproducing apparatus control method according to claim 10, wherein the digest reproducing apparatus receives information on the specified number of scenes to be reproduced in the digest, which is entered through a user interface.

15. The digest reproducing apparatus control method according to claim 14, wherein the digest reproducing apparatus:

receives information on reproducing time of the digest which is entered through a user interface; and

reproduces still images included in the specified number of scenes selected according to the ranking, in time order as a digest in which the reproducing time of each scene corresponds to a time duration obtained by dividing the digest reproducing time by the specified number.

16. The digest reproducing apparatus control method according to claim 15, wherein the digest reproducing apparatus reproduces still images included in the specified number of scenes selected according to the ranking, in time order as a digest in which each scene begins from a still image with the highest significance level index value in the scene and reproducing time of each scene corresponds to a time duration obtained by dividing the digest reproducing time by the specified number.

17. The digest reproducing apparatus control method according to claim 10, wherein the digest reproducing apparatus receives broadcast sound and image data as the motion video data.

18. The digest reproducing apparatus control method according to claim 10, wherein the digest reproducing apparatus receives, as the motion video data, sound and image data which is sent from a data processing unit connected in a communicable manner.

19. A method of controlling a digest reproducing apparatus which records, as motion video data, data on a plurality of still images obtained by encoding a plurality of consecutive still images in time order, the motion video made up of two scenes, wherein:

when the digest reproducing apparatus receives 1 as the number of scenes to be reproduced in a digest as a summary of the motion video, from a user interface, the digest reproducing apparatus reproduces still images included in one of the two scenes in time order as a digest.